Campaign buying upgrades/Engineers

I'm going through the campaign first time today, and I've won a number of rounds.  I'm looking at the campaign start screen and I see about 10 things in the "Labor Pool" to purchase for the coming rounds.  Well, I can buy the Patent Office ad the Engineering Upgrader thing, but I haven't been able to find an upgrade to let me make Chemicals or Electronics.  Being that Chemicals are pretty much necessary to run the Patent and Engineering buildings, I wonder if I'm missing something.  Like is there a way to see other upgrades in the Labor Pool that I can spend my funds on, that I'm missing?